The same thing happened to me on my Nikon Coolpix 4500.
One of the pins got bent when I first (eagerly) loaded up my IBM Microdrive.
This is what I used. It's a straightened paperclip, with a small 90 degree bent at the end, sharpened with a file on both sides so it can get under a bent pin that's flat against the bottom of the CF slot:
